My car seems slower than usual for no reason. No codes. Haven't been driving with shift plus on. I keep very good care of my car. But it just seems slower on the past couple of tanks of gas. If used fuel system cleaner and such with no luck. Only other issue is when I got my trans fluid changed at AAMCO last summer they checked for codes and said they couldn't get a signal from my ECU. Any thought or comments on what could be causing all this?